
Gas mask, Germany, 1915-1918
1915-1918
1915-1918
1920-1925
1917
1918-1920
1919
1918
1920
1909-1910
circa 1915
1830 (original); 1967 (model)
1925-1926
1952-3
1910
1910
1924
1909
1918
1915
1914-1918
1913
2000-100 BCE
1910
1927
1908
1912
1914-1918
1915-1925
1914
1910
1922
1925
1928
1921
1934
before 1928
1925-1928
1926
1927-1929
1914-1918
1914-1918
1912-1922
1920-1929
1912
1920
1910-1920
1928
1955; 1830
1915
1918
circa 1910